Open Access

High prevalence of quasi-legal psychoactive substance use among male patients in HIV care in Japan: a cross-sectional study

Substance Abuse Treatment, Prevention, and Policy201712:11

https://doi.org/10.1186/s13011-017-0097-2

Received: 24 December 2016

Accepted: 22 February 2017

Published: 23 February 2017

Abstract

Background

Syndemics of illicit drug use and HIV remain as significant public health issues around the world. There has been increasing concern regarding the rapidly growing market of new psychoactive substances, particularly in Asia. In response, the Japanese government has increasingly banned such substances in recent years. We sought to identify the prevalence and correlates of use of quasi-legal psychoactive substances among people living with HIV/AIDS (PLHIV) in Japan.

Methods

Data were derived from a nationwide survey of PLHIV conducted at nine leading HIV/AIDS care hospitals between July and December 2013. The prevalence and correlates of the use of quasi-legal psychoactive substances (e.g., synthetic cannabinoids, cathinone derivatives, etc. that had not been prohibited from using at the time of survey) among male participants were examined using multivariate survey logistic regression.

Results

Among 963 study participants, the majority (95.3%) were male. The most commonly used drug among men was quasi-legal psychoactive substances (55.3% ever and 12.8% in the previous year). In multivariate analysis, the lifetime use of tryptamine-type derivatives (i.e., 5-MeO-DIPT or N,N-diisopropyl-5-methoxytryptamine) (adjusted odds ratio [AOR]: 2.42; 95% confidence interval [CI]: 1.36–4.28) and methamphetamine/amphetamine (AOR: 3.59; 95% CI: 2.13–6.04) were independently associated with recent quasi-legal psychoactive substance use.

Conclusions

In our sample of male PLHIV in Japan, quasi-legal psychoactive substances were the most commonly used drugs. Individuals who had ever used tryptamine-type derivatives or methamphetamine/amphetamine were more likely to report recent quasi-legal psychoactive substance use, suggesting a potential shift in drug use patterns from regulated to unregulated substances among this population. These findings indicate a need for further research to examine implications for HIV care.

Keywords

New psychoactive substanceHIV/AIDSDrug and narcotic controlMen who have sex with menEpidemiologyJapan

Background

Many countries in the world are contending with syndemics of illicit drug use and HIV/AIDS [1, 2]. In Asia, unsafe injection use of opioids has traditionally been a key driver of HIV epidemics [2]. However, a growing body of research indicates that non-injection use of amphetamine-type stimulants is also common, and associated with an elevated HIV risk [24]. Specifically, methamphetamine use has been shown to be highly prevalent, particularly among men who have sex with men (MSM), increase HIV seroconversion due to the associated risky sexual behaviour, and compromise HIV treatment outcomes [57]. However, little is known about the extent and patterns of use of other synthetic drugs in this context. This is concerning because the Asia-Pacific region has recently experienced explosive increases in the availability of a variety of quasi-legal, mostly synthetic psychoactive substances [8]. These substances are designed to mimic the pharmacological effects of regulated substances including methamphetamine [8].

In Japan, the prevalence of illicit drug use in the general population has historically been low at <3% (lifetime use) [9]. The prevalence of HIV infection has also been low at <0.1% among the general population over the past three decades [10]. However, as in other parts of Asia, the burden of HIV is disproportionately concentrated among MSM [10]. It has been estimated that MSM accounted for over half of the recorded HIV diagnoses [11]. Previous studies reported a very high prevalence (40%) of illicit drug use among HIV-positive MSM in one hospital in Tokyo [12]. Illicit drug use was identified as an independent predictor of loss to follow-up for HIV care and hepatitis C virus infection in this setting [13, 14]. However, these studies did not fully differentiate the use of traditional illicit drugs (e.g., methamphetamine, heroin) and other quasi-legal psychoactive substances.

In response to the explosive spread of quasi-legal synthetic psychoactive substances [15], the Japanese government has made a series of important changes to the drug control legislation over the past decade. Through the 2006 amendment of the Pharmaceutical Affairs Law, quasi-legal synthetic drugs that were deemed to have the potential to cause health-related harms were newly classified as “Designated Substances” [15]. The supply of these substances for non-medical purposes was prohibited [15]. By March 2013, 106 substances, including synthetic cannabinoids, tryptamine-type derivatives and phenethylamine derivatives, were listed as Designated Substances [15, 16]. Since 2013, generic scheduling for certain types of synthetic cannabinoids and cathinone derivatives has also been introduced [16].

Despite the tighter control of supply, the possession and consumption of Designated Substances have remained largely unregulated. By March 2013, only 13 of the 106 Designated Substances, including mephedrone and tryptamine-type derivatives (e.g., 5-MeO-DIPT and Foxy [N,N-diisopropyl-5-methoxytryptamine]), have been categorized as “Narcotics” under the Narcotics and Psychotropics Control Law and thereby have been prohibited from possessing and consuming [16]. As such, many Designated Substances have continued to be sold as herbal products, aroma products and bath salts, even in vending machines on the street.

While drug use patterns could be affected by these legislation changes, there is a paucity of epidemiologic data regarding the use of quasi-legal psychoactive substances (i.e., substances that have not been prohibited from possessing or consuming under the Narcotics and Psychotropics Control Law) in Japan [9]. Given the previous studies suggesting that illicit drug use could compromise HIV care and increase adverse health outcomes among HIV-positive MSM in this setting [13, 14], we sought to identify the prevalence and correlates of quasi-legal psychoactive substance use among a large nationwide sample of people living with HIV/AIDS (PLHIV) in Japan.

Methods

Study design

Data for this study were derived from a nationwide cross-sectional survey of PLHIV conducted at nine leading HIV/AIDS referral hospitals in Japan between July and December 2013. In brief, beginning in 2003, this is a quinquennial survey that aims to investigate the health and lifestyles among PLHIV in Japan. The nine hospitals included in the survey represent tertiary care hospitals and collectively cover the eight major geographical regions in Japan. In each hospital, HIV/AIDS medical professionals were asked to recruit their patients living with HIV/AIDS in a serial manner as patients visit their hospitals. They explained the study objectives and procedures to potential participants, and obtained informed consent from them. The recruitment was continued until approximately 40% of their patients provided informed consent. While we did not count the number of patients who refused to participate in the survey, informal reports from hospitals indicated that such cases were rare. Consented patients were asked to self-complete an anonymous questionnaire and return it to an independent researcher using a self-addressed, stamped envelope provided with the questionnaire. The questionnaire elicited a range of information, including socio-demographic characteristics, HIV-related clinical histories, general health status, and substance use histories. All consented individuals received a 500 Japanese Yen (approximately US$5.00) gift certificate. The study was approved by the research ethics boards at the Saitama Prefectural University as well as each participating hospital.

Participants and measures

In total, 1,100 (61.6%) of 1,786 consented individuals completed and returned the questionnaire, including 51 (4.7%) females. For a gender-based descriptive analysis of drug use patterns, the sample was restricted to 963 (87.5%) individuals (918 males and 45 females) who had complete data. For an analysis examining correlates of past year quasi-legal psychoactive substance use among men, the sample was further restricted to 895 male participants with complete data.

For the present analysis, the primary outcome of interest was reporting quasi-legal psychoactive substance use in the previous year, defined as answering “Yes” to a question: “In the past year, have you used quasi-legal drugs in the form of herbal products, aroma liquid, powder, oil, bath salts, or amyl nitrites including ‘rush’ and ‘poppers’?” As such, quasi-legal psychoactive substances encompassed a range of substances that had been largely regulated as Designated Substances but had not been prohibited from possessing or consuming under the Narcotics and Psychotropics Control Law by December 2013. Specifically, these substances would include synthetic cannabinoids, synthetic cathinones, phenethylamine and thiophene derivatives, and amyl nitrites (e.g., rush, poppers). The term “quasi-legal drugs” was used because it commonly referred to the aforementioned set of quasi-legal psychoactive substances of our interest in Japan, and also because people usually do not know the exact substance contained in the product.

Then, we selected a range of explanatory variables that we hypothesized were potentially associated with the outcome. Socio-demographic characteristics included: age; education (< secondary education vs. ≥ secondary education); currently living alone (yes vs. no) and annual income (<1 million, 1–2.99 million, 3–4.99 million vs. ≥ 5 million Yen). HIV-related measures included: antiretroviral therapy (ART) use (currently on ART vs. never on ART); ever had AIDS (yes vs. no); perceived route of HIV exposure (male-to-male sexual behaviour vs. other; as a proxy measure for MSM); and engagement in HIV-related peer support groups in the previous year (yes vs. no). Psychological distress was measured using the Kessler psychological distress scale (K6) [17]. This variable was dichotomized into a score of ≥ 13 vs. a score of < 13, using the recommended cut-off score to screen serious mental illness [17]. Histories of Illicit drug use included: ever used tryptamine-type derivatives (i.e., 5-MeO-DIPT or Foxy [N,N-diisopropyl-5-methoxytryptamine]), ever used cannabis, ever used methamphetamine/amphetamine, ever used MDMA, and ever used heroin/cocaine (all yes vs. no).

Statistical analyses

First, socio-demographic and HV-related clinical characteristics were compared between males and females, using the Wilcoxon Rank Sum Test (for continuous variables) and the Pearson’s Chi-squared test (for categorical variables). Since the prevalence of drug use was extremely low among women (11.1% ever and 0% in the previous year), descriptive statistics were used to compare drug use patterns between males and females.

For bivariate and multivariate analyses of factors predicting past year quasi-legal psychoactive substance use among male participants, we used the survey logistic regression in the SAS software to account for possible clustering effects at the hospital level. A multivariate model was fit using an a priori-defined statistical protocol whereby all variables that were significantly associated with past year quasi-legal psychoactive substance use at the p < 0.05 level in the bivariate logistic regression analyses. In a sub-analysis, we examined the proportion of those who had never used any illicit drugs (i.e., tryptamine-type derivatives, cannabis, methamphetamine/amphetamine, MDMA, heroin or cocaine) among male participants who used quasi-legal psychoactive substance in the previous year. We also examined the proportion of those who used drugs for sexual activities in the previous year among the same aforementioned sub-sample. All p-values were two-sided. All statistical analyses were performed using SAS software version 9.3 (SAS, Cary, NC).

Results

In total, 963 participants were eligible for the present study, including 45 (4.7%) females. Table 1 shows sample characteristics and drug use patterns, stratified by gender. As shown, the median age of the entire sample was 42 (interquartile range: 37–50) years. There was no significant gender-based difference in age. While female participants were more likely than males to be diagnosed with HIV before 2005, the majority of both males and females reported currently receiving ART. Annual income was significantly lower among women, compared to men. Among men, more than half reported a history of illicit drug use (including quasi-legal psychoactive substances), while only a handful of women did so. Among men, the most commonly used drug was quasi-legal psychoactive substances, followed by 5-MeO-DPT/Foxy and methamphetamine/amphetamine. Of note, the use of 5-MeO-DPT/Foxy in the previous year substantially dropped to 0.4%. Among women, the most commonly used drug was cannabis, followed by quasi-legal psychoactive substances and methamphetamine/amphetamine.
Table 1

Drug use patterns among HIV-positive male and female patients accessing HIV care in Japan (n = 963)

Characteristic

Total n (%)

Male

Female

p – value

918 (95.3%)

45 (4.7%)

Age (median, IQR)

42 (37–50)

42 (37–50)

41 (35–48)

0.4491

Calendar year of HIV diagnosis

   

<0.0012

 1984–2005

337 (35.0%)

309 (33.7%)

28 (62.2%)

 

 2006–2009

302 (31.4%)

293 (31.9%)

9 (20.0%)

 

 2010–2013

324 (33.6%)

316 (34.4%)

8 (17.8%)

 

Currently receiving ART

911 (94.6%)

870 (94.8%)

41 (91.1%)

0.2893

Annual income

   

0.0444

  < 1 million Yena

272 (28.3%)

253 (27.5%)

19 (42.2%)

 

 1–2.99 million Yena

242 (25.1%)

231 (25.2%)

11 (24.4%)

 

 3–4.99 million Yena

243 (25.2%)

231 (25.2%)

12 (26.7%)

 

  ≥ 5 million Yena

206 (21.4%)

203 (22.1%)

3 (6.7%)

 

Quasi-legal psychoactive substance useb

   

 Ever

510 (53.0%)

508 (55.3%)

2 (4.4%)

 

 In the previous year

117 (12.2%)

117 (12.8%)

0 (0.0%)

 

Tryptamine-type derivatives (i.e., 5-MeO-DPT or Foxy) use

  

 Ever

255 (26.5%)

255 (27.8%)

0 (0.0%)

 

 In the previous year

4 (0.4%)

4 (0.4%)

0 (0.0%)

 

Cannabis use

    

 Ever

91 (9.5%)

88 (9.6%)

3 (6.7%)

 

 In the previous year

4 (0.4%)

4 (0.4%)

0 (0.0%)

 

Methamphetamine/amphetamine use

   

 Ever

110 (11.4%)

109 (11.9%)

1 (2.2%)

 

 In the previous year

23 (2.4%)

23 (2.5%)

0 (0.0%)

 

MDMA use

    

 Ever

58 (6.0%)

58 (6.3%)

0 (0.0%)

 

 In the previous year

4 (0.4%)

4 (0.4%)

0 (0.0%)

 

Heroin use

    

 Ever

5 (0.5%)

5 (0.5%)

0 (0.0%)

 

 In the previous year

0 (0.0%)

0 (0.0%)

0 (0.0%)

 

Cocaine use

    

 Ever

22 (2.3%)

22 (2.4%)

0 (0.0%)

 

 In the previous year

1 (0.1%)

1 (0.1%)

0 (0.0%)

 

Use of any drugs listed above

    

 Ever

522 (54.2%)

517 (56.3%)

5 (11.1%)

 

 In the previous year

127 (13.2%)

127 (13.8%)

0 (0.0%)

 

IQR interquartile range

1 P-value was derived from the Wilcoxon Rank Sum Test

2Chi-square value = 15.475, df = 2

3Chi-square value = 1.125, df = 1

4Chi-square value = 8.098, df = 3

aUS$1.00 ≈ 100 Yen. “<1 million Yen” includes those without any income

bIncludes variations of synthetic cannabinoids, synthetic cathinones, phenethylamine and thiophene derivatives, and amyl nitrites (e.g., rush, poppers). At the time of surveying, the possession or consumption of these substances was not prohibited

Table 2 shows the results of bivariate analyses of factors predicting past year quasi-legal psychoactive substance use among male participants. As shown, factors significantly associated with the outcome included: age; currently living alone; male-to-male sexual behaviour as a perceived route of HIV exposure; and all illicit drug use histories considered.
Table 2

Bivariate analyses of factors predicting past year quasi-legal psychoactive substance use among HIV-positive males accessing HIV care in Japan (n = 895)

Characteristic

Quasi-legal psychoactive substance use in the previous year

Odds Ratio (95% CI)

p - value

 

Yes 115 (12.9%)

No 780 (87.1%)

  

Age

 Median (IQR)

39 (33–44)

43 (37–52)

  

 Per year older

  

0.95 (0.93–0.97)

<0.001

Education

  < Secondary education

1 (0.9%)

21 (2.7%)

0.32 (0.07–1.53)

0.153

  ≥ Secondary education

114 (99.1%)

759 (97.3%)

ref

 

Currently living alone

 Yes

61 (53.0%)

344 (44.1%)

1.43 (1.04–1.97)

0.028

 No

54 (47.0%)

436 (55.9%)

ref

 

Annual income

  < 1 million Yena

28 (24.4%)

210 (26.9%)

0.76 (0.54–1.09)

0.444

 1–2.99 million Yena

29 (25.2%)

196 (25.1%)

0.85 (0.52–1.39)

0.995

 3–4.99 million Yena

28 (24.3%)

202 (25.9%)

0.80 (0.63–1.01)

0.518

  ≥ 5 million Yena

30 (26.1%)

171 (22.1%)

ref

 

ART use

 Currently on ART

106 (92.2%)

741 (95.0%)

0.62 (0.29–1.31)

0.210

 Never on ART

9 (7.8%)

39 (5.0%)

ref

 

Ever had AIDS

 Yes

32 (27.8%)

236 (30.3%)

0.89 (0.55–1.43)

0.625

 No

83 (72.2%)

544 (69.7%)

ref

 

Perceived route of HIV exposure

 Male-to-male sexual behaviour

111 (96.5%)

647 (82.9%)

5.70 (3.29–9.88)

<0.001

 Other

4 (3.5%)

133 (17.1%)

ref

 

Engagement in HIV-related peer support groups in the previous year

 Yes

9 (7.8%)

46 (5.9%)

1.36 (0.67–2.72)

0.394

 No

106 (92.2%)

734 (94.1%)

ref

 

Kessler psychological distress scale (K6)

 Score of ≥ 13

13 (11.3%)

99 (12.7%)

0.88 (0.48–1.61)

0.672

 Score of < 13

102 (88.7%)

681 (87.3%)

ref

 

Ever used tryptamine-type derivatives (5-MeO-DPT or Foxy)

 Yes

65 (56.5%)

187 (24.0%)

4.12 (2.90–5.86)

<0.001

 No

50 (43.5%)

593 (76.0%)

ref

 

Ever used cannabis

 Yes

25 (21.7%)

62 (8.0%)

3.22 (1.79–5.78)

<0.001

 No

90 (78.3%)

718 (92.0%)

ref

 

Ever used methamphetamine/amphetamine

 Yes

41 (35.7%)

68 (8.7%)

5.80 (3.79–8.88)

<0.001

 No

74 (64.3%)

712 (91.3%)

ref

 

Ever used MDMA

 Yes

19 (16.5%)

39 (5.0%)

3.76 (2.41–5.87)

<0.001

 No

96 (83.5%)

741 (95.0%)

ref

 

Ever used heroin or cocaine

 Yes

8 (7.0%)

15 (1.9%)

3.81 (1.62–9.01)

0.002

 No

107 (93.0%)

765 (98.1%)

ref

 

IQR: interquartile range. ART: antiretroviral therapy

aUS$1.00 ≈ 100 Yen. “<1 million Yen” includes those without any income

Table 3 presents the results of the multivariate logistic regression analysis. As presented, age remained independently and negatively associated with past year quasi-legal psychoactive substance use. Factors that remained independently and positively associated with past year quasi-legal psychoactive substance use included: currently living alone; male-to-male sexual behaviour as a perceived route of HIV exposure; ever used 5-MeO-DPT/Foxy; and ever used methamphetamine/amphetamine.
Table 3

Multivariate logistic regression analysis of factors predicting past year quasi-legal psychoactive substance use among HIV-positive males accessing HIV care in Japan (n = 895)

Variable

Adjusted Odds Ratio

95% Confidence Interval

p - value

Age

 (per year older)

0.96

(0.93–0.99)

0.004

Living alone

 (yes vs. no)

1.66

(1.10–2.49)

0.015

Perceived route of HIV exposure

 (male-to-male sexual behaviour vs. other)

2.56

(1.48–4.43)

<0.001

Ever used tryptamine-type derivatives (5-MeO-DPT or Foxy)

 (yes vs. no)

2.42

(1.36–4.28)

0.003

Ever used cannabis

 (yes vs. no)

1.04

(0.51–2.12)

0.912

Ever used methamphetamine/amphetamine

 (yes vs. no)

3.59

(2.13–6.04)

<0.001

Ever used MDMA

 (yes vs. no)

0.90

(0.54–1.48)

0.667

Ever used heroin or cocaine

 (yes vs. no)

1.04

(0.56–1.96)

0.895

In the sub-analysis, among the 115 male participants who used quasi-legal psychoactive substances in the previous year, 38 (33.0%) reported having never used other illicit drugs. Sixty-nine (60.0%) individuals reported having used drugs for sexual activities in the previous year.

Discussion

In our sample of PLHIV in Japan, illicit drug use was much more common among males than females. The most commonly used drugs among men were quasi-legal psychoactive substances. Over half of male participants reported having ever used quasi-legal psychoactive substances, and approximately 12% reported having used these substances in the previous year. The majority (97%) of those who used quasi-legal psychoactive substances in the previous year were presumably MSM. Approximately one-third of them had no history of using other illicit drugs. In the multivariate analysis, the lifetime use of 5-MeO-DPT/Foxy or methamphetamine/amphetamine, younger age, living alone, and male-to-male sexual behaviour as a perceived route of HIV exposure were independently and positively associated with recent quasi-legal psychoactive substance use among male PLHIV.

We found that male PLHIV who had ever used 5-MeO-DPT/Foxy were more likely to have used quasi-legal psychoactive substances in the previous year. While the cross-sectional nature of the study limits the assessment of temporal relationships, available data and literature suggest possible shifts in the patterns of drug use in this setting, from the use of fully banned to yet-to-be-fully-prohibited substances. As presented in Table 1, in our sample, 5-MeO-DPT/Foxy were second-ranked among the drugs that have ever been used in the lifetime (28%). However, past year use substantially dropped to <0.5%. Given that these tryptamine-type derivatives became fully prohibited under the Narcotics and Psychotropics Control Law in 2005, our findings suggest that “substance displacement” might have occurred in this setting [18] whereby those who had used these illegal stimulants may have shifted to other quasi-legal psychoactive substances with similar psychoactive effects as these psychoactive substances became easily available. This is also congruent with previous forensic laboratory reports suggesting that stricter controls of certain substances have met with the emergence of new analogues of controlled substances in Japan [16].

Likewise, the independent association between lifetime use of methamphetamine/amphetamine and recent use of quasi-legal psychoactive substances could also be interpreted as switching from the former to the latter. However, a recent qualitative study reported that quasi-legal psychoactive substance use might subsequently lead to the use of methamphetamine/amphetamine among some PLHIV in Japan [19]. In light of this previous study finding, the observed association may also suggest that some of those who used quasi-legal psychoactive substances in the previous year subsequently used methamphetamine/amphetamine. Future research should determine the potential role of quasi-legal psychoactive substance use in the initiation of methamphetamine/amphetamine use in this setting.

We also found that those who were younger and those who were likely MSM were more likely to report recent use of quasi-legal psychoactive substances. This is consistent with a previous study conducted in Tokyo [12]. According to a recent qualitative investigation of patterns of illicit drug use among HIV-positive MSM in Japan, illicit drugs (including quasi-legal psychoactive substances) were used for several purposes in this population, including as a strategy to cope with depression and sexual minority stress, and as a sexual stimulant [20]. Regardless of the purposes, illicit drug use often resulted in increasing sexual HIV risk behaviour [20]. Consistent with these qualitative research findings, in our study, two-thirds of the past year quasi-legal psychoactive substance users reported having used drugs for sexual purposes. Previous literature also indicated high rates of sexual stimulant use among HIV-positive MSM in other countries [21]. Ongoing quasi-legal psychoactive substance use and the potentially associated risky sexual behaviour among HIV-positive MSM are concerning. They warrant greater efforts to address factors that lead to illicit drug use and to reduce drug-related harms in this setting.

Internationally, identifying effective regulations of new psychoactive substances is a major topic of debate [22, 23]. In April 2014, the Japanese government penalized the personal possession and consumption of all Designated Substances [24]. This legislation change in Japan, which outright banned more than 1,300 Designated Substances [24], could be viewed as a bold attempt to contain the illicit psychoactive substance market through law enforcement. Some commentators raised a concern regarding the overreliance on such law enforcement-based approaches [25]. They claimed that as new psychoactive substances are moving targets, such approaches may potentially increase the drug-related harm among those who continue to use those controlled substances [25]. Our findings suggesting the possible shift from the use of banned to unregulated substances reinforce the concern. Given that new unregulated substances may pose increased or different kinds of harm, the findings indicate a need to address various social and structural factors that predispose vulnerable populations to illicit drug use and the associated harm.

Our study has several limitations. First, as the study sample was not randomly selected, our findings may not be generalizable to PLHIV in Japan or elsewhere. Second, the self-reported data may be affected by reporting biases, including recall bias and socially desirable responding. However, we note that the anonymous nature of the questionnaire may have helped reduce some of the biases. Third, as with all observational studies, the associations between the explanatory variables and outcome assessed may be under the influence of unmeasured confounding factors. However, we sought to address this bias with multivariate adjustment of the key demographic and behavioural predictors of quasi-legal psychoactive substance use.

Conclusion

In sum, illicit drug use was much more common among male patients in HIV care in Japan, compared to their female counterparts. Among male participants, quasi-legal psychoactive substances were the most commonly used drugs. We also found a substantial decline in recent use of 5-MeO-DPT/Foxy. Individuals who had ever used these tryptamine derivatives or methamphetamine/amphetamine were more likely to report recent quasi-legal psychoactive substance use. These findings suggest a potential shift in drug use patterns from regulated to unregulated substances among this population. Given that a new regulation instituted in April 2014 fully banned presumably most of the quasi-legal psychoactive substances considered in this study, further research is warranted to examine changing drug patterns and implications for HIV care in this setting.

Abbreviations

AIDS: 

Acquired immune deficiency syndrome

HIV: 

Human immunodeficiency virus

MSM: 

Men who have sex with men

PLHIV: 

People living with HIV/AIDS

Declarations

Acknowledgements

The authors thank the study participants for their contribution to the research, as well as current and past researchers and staff.

Funding

The study was supported by the Japanese Ministry of Health, Labour and Welfare’s Sciences Research Grant (H24-AIDS-013). Kanna Hayashi is supported by the Canadian Institutes of Health Research New Investigator Award (MSH-141971).

Availability of data and materials

The data used for this study is not publicly available. For further information on the data and materials used in this study, please contact the corresponding author.

Authors’ contributions

CW, YI and MT designed and implemented the survey. KH designed the present analysis plan, conducted the statistical analyses, drafted the manuscript, and incorporated suggestions from all co-authors. All authors made significant contributions to the conception of the analyses, interpretation of the data, and drafting of the manuscript.

Competing interests

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this paper.

Consent for publication

Not applicable.

Ethics approval and consent to participate

All participants provided written informed consent for study participation. The study was approved by the research ethics boards at the Saitama Prefectural University as well as each participating hospital.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
British Columbia Centre for Excellence in HIV/AIDS, St. Paul’s Hospital
(2)
Faculty of Health Sciences, Simon Fraser University
(3)
Department of Health Sciences, Saitama Prefectural University
(4)
Positive Living and Community Empowerment Tokyo (Place Tokyo)
(5)
Faculty of Letters, Keio University
(6)
BC Centre for Excellence in HIV/AIDS

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